1 /*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21 /*
22 * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
23 * Copyright (c) 2011, 2015 by Delphix. All rights reserved.
24 */
25
26 /*
27 * DSL permissions are stored in a two level zap attribute
28 * mechanism. The first level identifies the "class" of
29 * entry. The class is identified by the first 2 letters of
30 * the attribute. The second letter "l" or "d" identifies whether
31 * it is a local or descendent permission. The first letter
32 * identifies the type of entry.
33 *
34 * ul$<id> identifies permissions granted locally for this userid.
35 * ud$<id> identifies permissions granted on descendent datasets for
36 * this userid.
37 * Ul$<id> identifies permission sets granted locally for this userid.
38 * Ud$<id> identifies permission sets granted on descendent datasets for
39 * this userid.
40 * gl$<id> identifies permissions granted locally for this groupid.
41 * gd$<id> identifies permissions granted on descendent datasets for
42 * this groupid.
43 * Gl$<id> identifies permission sets granted locally for this groupid.
44 * Gd$<id> identifies permission sets granted on descendent datasets for
45 * this groupid.
46 * el$ identifies permissions granted locally for everyone.
47 * ed$ identifies permissions granted on descendent datasets
48 * for everyone.
49 * El$ identifies permission sets granted locally for everyone.
50 * Ed$ identifies permission sets granted to descendent datasets for
51 * everyone.
52 * c-$ identifies permission to create at dataset creation time.
53 * C-$ identifies permission sets to grant locally at dataset creation
54 * time.
55 * s-$@<name> permissions defined in specified set @<name>
56 * S-$@<name> Sets defined in named set @<name>
57 *
58 * Each of the above entities points to another zap attribute that contains one
59 * attribute for each allowed permission, such as create, destroy,...
60 * All of the "upper" case class types will specify permission set names
61 * rather than permissions.
62 *
63 * Basically it looks something like this:
64 * ul$12 -> ZAP OBJ -> permissions...
65 *
66 * The ZAP OBJ is referred to as the jump object.
67 */
68
69 #include <sys/dmu.h>
70 #include <sys/dmu_objset.h>
71 #include <sys/dmu_tx.h>
72 #include <sys/dsl_dataset.h>
73 #include <sys/dsl_dir.h>
74 #include <sys/dsl_prop.h>
75 #include <sys/dsl_synctask.h>
76 #include <sys/dsl_deleg.h>
77 #include <sys/spa.h>
78 #include <sys/zap.h>
79 #include <sys/fs/zfs.h>
80 #include <sys/cred.h>
81 #include <sys/sunddi.h>
82
83 #include "zfs_deleg.h"
84
85 /*
86 * Validate that user is allowed to delegate specified permissions.
87 *
88 * In order to delegate "create" you must have "create"
89 * and "allow".
90 */
91 int
dsl_deleg_can_allow(char * ddname,nvlist_t * nvp,cred_t * cr)92 dsl_deleg_can_allow(char *ddname, nvlist_t *nvp, cred_t *cr)
93 {
94 nvpair_t *whopair = NULL;
95 int error;
96
97 if ((error = dsl_deleg_access(ddname, ZFS_DELEG_PERM_ALLOW, cr)) != 0)
98 return (error);
99
100 while (whopair = nvlist_next_nvpair(nvp, whopair)) {
101 nvlist_t *perms;
102 nvpair_t *permpair = NULL;
103
104 VERIFY(nvpair_value_nvlist(whopair, &perms) == 0);
105
106 while (permpair = nvlist_next_nvpair(perms, permpair)) {
107 const char *perm = nvpair_name(permpair);
108
109 if (strcmp(perm, ZFS_DELEG_PERM_ALLOW) == 0)
110 return (SET_ERROR(EPERM));
111
112 if ((error = dsl_deleg_access(ddname, perm, cr)) != 0)
113 return (error);
114 }
115 }
116 return (0);
117 }
118
119 /*
120 * Validate that user is allowed to unallow specified permissions. They
121 * must have the 'allow' permission, and even then can only unallow
122 * perms for their uid.
123 */
124 int
dsl_deleg_can_unallow(char * ddname,nvlist_t * nvp,cred_t * cr)125 dsl_deleg_can_unallow(char *ddname, nvlist_t *nvp, cred_t *cr)
126 {
127 nvpair_t *whopair = NULL;
128 int error;
129 char idstr[32];
130
131 if ((error = dsl_deleg_access(ddname, ZFS_DELEG_PERM_ALLOW, cr)) != 0)
132 return (error);
133
134 (void) snprintf(idstr, sizeof (idstr), "%lld",
135 (longlong_t)crgetuid(cr));
136
137 while (whopair = nvlist_next_nvpair(nvp, whopair)) {
138 zfs_deleg_who_type_t type = nvpair_name(whopair)[0];
139
140 if (type != ZFS_DELEG_USER &&
141 type != ZFS_DELEG_USER_SETS)
142 return (SET_ERROR(EPERM));
143
144 if (strcmp(idstr, &nvpair_name(whopair)[3]) != 0)
145 return (SET_ERROR(EPERM));
146 }
147 return (0);
148 }
149
150 typedef struct dsl_deleg_arg {
151 const char *dda_name;
152 nvlist_t *dda_nvlist;
153 } dsl_deleg_arg_t;
154
155 static void
dsl_deleg_set_sync(void * arg,dmu_tx_t * tx)156 dsl_deleg_set_sync(void *arg, dmu_tx_t *tx)
157 {
158 dsl_deleg_arg_t *dda = arg;
159 dsl_dir_t *dd;
160 dsl_pool_t *dp = dmu_tx_pool(tx);
161 objset_t *mos = dp->dp_meta_objset;
162 nvpair_t *whopair = NULL;
163 uint64_t zapobj;
164
165 VERIFY0(dsl_dir_hold(dp, dda->dda_name, FTAG, &dd, NULL));
166
167 zapobj = dsl_dir_phys(dd)->dd_deleg_zapobj;
168 if (zapobj == 0) {
169 dmu_buf_will_dirty(dd->dd_dbuf, tx);
170 zapobj = dsl_dir_phys(dd)->dd_deleg_zapobj = zap_create(mos,
171 DMU_OT_DSL_PERMS, DMU_OT_NONE, 0, tx);
172 }
173
174 while (whopair = nvlist_next_nvpair(dda->dda_nvlist, whopair)) {
175 const char *whokey = nvpair_name(whopair);
176 nvlist_t *perms;
177 nvpair_t *permpair = NULL;
178 uint64_t jumpobj;
179
180 perms = fnvpair_value_nvlist(whopair);
181
182 if (zap_lookup(mos, zapobj, whokey, 8, 1, &jumpobj) != 0) {
183 jumpobj = zap_create_link(mos, DMU_OT_DSL_PERMS,
184 zapobj, whokey, tx);
185 }
186
187 while (permpair = nvlist_next_nvpair(perms, permpair)) {
188 const char *perm = nvpair_name(permpair);
189 uint64_t n = 0;
190
191 VERIFY(zap_update(mos, jumpobj,
192 perm, 8, 1, &n, tx) == 0);
193 spa_history_log_internal_dd(dd, "permission update", tx,
194 "%s %s", whokey, perm);
195 }
196 }
197 dsl_dir_rele(dd, FTAG);
198 }
199
200 static void
dsl_deleg_unset_sync(void * arg,dmu_tx_t * tx)201 dsl_deleg_unset_sync(void *arg, dmu_tx_t *tx)
202 {
203 dsl_deleg_arg_t *dda = arg;
204 dsl_dir_t *dd;
205 dsl_pool_t *dp = dmu_tx_pool(tx);
206 objset_t *mos = dp->dp_meta_objset;
207 nvpair_t *whopair = NULL;
208 uint64_t zapobj;
209
210 VERIFY0(dsl_dir_hold(dp, dda->dda_name, FTAG, &dd, NULL));
211 zapobj = dsl_dir_phys(dd)->dd_deleg_zapobj;
212 if (zapobj == 0) {
213 dsl_dir_rele(dd, FTAG);
214 return;
215 }
216
217 while (whopair = nvlist_next_nvpair(dda->dda_nvlist, whopair)) {
218 const char *whokey = nvpair_name(whopair);
219 nvlist_t *perms;
220 nvpair_t *permpair = NULL;
221 uint64_t jumpobj;
222
223 if (nvpair_value_nvlist(whopair, &perms) != 0) {
224 if (zap_lookup(mos, zapobj, whokey, 8,
225 1, &jumpobj) == 0) {
226 (void) zap_remove(mos, zapobj, whokey, tx);
227 VERIFY(0 == zap_destroy(mos, jumpobj, tx));
228 }
229 spa_history_log_internal_dd(dd, "permission who remove",
230 tx, "%s", whokey);
231 continue;
232 }
233
234 if (zap_lookup(mos, zapobj, whokey, 8, 1, &jumpobj) != 0)
235 continue;
236
237 while (permpair = nvlist_next_nvpair(perms, permpair)) {
238 const char *perm = nvpair_name(permpair);
239 uint64_t n = 0;
240
241 (void) zap_remove(mos, jumpobj, perm, tx);
242 if (zap_count(mos, jumpobj, &n) == 0 && n == 0) {
243 (void) zap_remove(mos, zapobj,
244 whokey, tx);
245 VERIFY(0 == zap_destroy(mos,
246 jumpobj, tx));
247 }
248 spa_history_log_internal_dd(dd, "permission remove", tx,
249 "%s %s", whokey, perm);
250 }
251 }
252 dsl_dir_rele(dd, FTAG);
253 }
254
255 static int
dsl_deleg_check(void * arg,dmu_tx_t * tx)256 dsl_deleg_check(void *arg, dmu_tx_t *tx)
257 {
258 dsl_deleg_arg_t *dda = arg;
259 dsl_dir_t *dd;
260 int error;
261
262 if (spa_version(dmu_tx_pool(tx)->dp_spa) <
263 SPA_VERSION_DELEGATED_PERMS) {
264 return (SET_ERROR(ENOTSUP));
265 }
266
267 error = dsl_dir_hold(dmu_tx_pool(tx), dda->dda_name, FTAG, &dd, NULL);
268 if (error == 0)
269 dsl_dir_rele(dd, FTAG);
270 return (error);
271 }
272
273 int
dsl_deleg_set(const char * ddname,nvlist_t * nvp,boolean_t unset)274 dsl_deleg_set(const char *ddname, nvlist_t *nvp, boolean_t unset)
275 {
276 dsl_deleg_arg_t dda;
277
278 /* nvp must already have been verified to be valid */
279
280 dda.dda_name = ddname;
281 dda.dda_nvlist = nvp;
282
283 return (dsl_sync_task(ddname, dsl_deleg_check,
284 unset ? dsl_deleg_unset_sync : dsl_deleg_set_sync,
285 &dda, fnvlist_num_pairs(nvp), ZFS_SPACE_CHECK_RESERVED));
286 }
287
288 /*
289 * Find all 'allow' permissions from a given point and then continue
290 * traversing up to the root.
291 *
292 * This function constructs an nvlist of nvlists.
293 * each setpoint is an nvlist composed of an nvlist of an nvlist
294 * of the individual * users/groups/everyone/create
295 * permissions.
296 *
297 * The nvlist will look like this.
298 *
299 * { source fsname -> { whokeys { permissions,...}, ...}}
300 *
301 * The fsname nvpairs will be arranged in a bottom up order. For example,
302 * if we have the following structure a/b/c then the nvpairs for the fsnames
303 * will be ordered a/b/c, a/b, a.
304 */
305 int
dsl_deleg_get(const char * ddname,nvlist_t ** nvp)306 dsl_deleg_get(const char *ddname, nvlist_t **nvp)
307 {
308 dsl_dir_t *dd, *startdd;
309 dsl_pool_t *dp;
310 int error;
311 objset_t *mos;
312
313 error = dsl_pool_hold(ddname, FTAG, &dp);
314 if (error != 0)
315 return (error);
316
317 error = dsl_dir_hold(dp, ddname, FTAG, &startdd, NULL);
318 if (error != 0) {
319 dsl_pool_rele(dp, FTAG);
320 return (error);
321 }
322
323 dp = startdd->dd_pool;
324 mos = dp->dp_meta_objset;
325
326 VERIFY(nvlist_alloc(nvp, NV_UNIQUE_NAME, KM_SLEEP) == 0);
327
328 for (dd = startdd; dd != NULL; dd = dd->dd_parent) {
329 zap_cursor_t basezc;
330 zap_attribute_t baseza;
331 nvlist_t *sp_nvp;
332 uint64_t n;
333 char source[ZFS_MAX_DATASET_NAME_LEN];
334
335 if (dsl_dir_phys(dd)->dd_deleg_zapobj == 0 ||
336 zap_count(mos,
337 dsl_dir_phys(dd)->dd_deleg_zapobj, &n) != 0 || n == 0)
338 continue;
339
340 sp_nvp = fnvlist_alloc();
341 for (zap_cursor_init(&basezc, mos,
342 dsl_dir_phys(dd)->dd_deleg_zapobj);
343 zap_cursor_retrieve(&basezc, &baseza) == 0;
344 zap_cursor_advance(&basezc)) {
345 zap_cursor_t zc;
346 zap_attribute_t za;
347 nvlist_t *perms_nvp;
348
349 ASSERT(baseza.za_integer_length == 8);
350 ASSERT(baseza.za_num_integers == 1);
351
352 perms_nvp = fnvlist_alloc();
353 for (zap_cursor_init(&zc, mos, baseza.za_first_integer);
354 zap_cursor_retrieve(&zc, &za) == 0;
355 zap_cursor_advance(&zc)) {
356 fnvlist_add_boolean(perms_nvp, za.za_name);
357 }
358 zap_cursor_fini(&zc);
359 fnvlist_add_nvlist(sp_nvp, baseza.za_name, perms_nvp);
360 fnvlist_free(perms_nvp);
361 }
362
363 zap_cursor_fini(&basezc);
364
365 dsl_dir_name(dd, source);
366 fnvlist_add_nvlist(*nvp, source, sp_nvp);
367 nvlist_free(sp_nvp);
368 }
369
370 dsl_dir_rele(startdd, FTAG);
371 dsl_pool_rele(dp, FTAG);
372 return (0);
373 }
374
375 /*
376 * Routines for dsl_deleg_access() -- access checking.
377 */
378 typedef struct perm_set {
379 avl_node_t p_node;
380 boolean_t p_matched;
381 char p_setname[ZFS_MAX_DELEG_NAME];
382 } perm_set_t;
383
384 static int
perm_set_compare(const void * arg1,const void * arg2)385 perm_set_compare(const void *arg1, const void *arg2)
386 {
387 const perm_set_t *node1 = arg1;
388 const perm_set_t *node2 = arg2;
389 int val;
390
391 val = strcmp(node1->p_setname, node2->p_setname);
392 if (val == 0)
393 return (0);
394 return (val > 0 ? 1 : -1);
395 }
396
397 /*
398 * Determine whether a specified permission exists.
399 *
400 * First the base attribute has to be retrieved. i.e. ul$12
401 * Once the base object has been retrieved the actual permission
402 * is lookup up in the zap object the base object points to.
403 *
404 * Return 0 if permission exists, ENOENT if there is no whokey, EPERM if
405 * there is no perm in that jumpobj.
406 */
407 static int
dsl_check_access(objset_t * mos,uint64_t zapobj,char type,char checkflag,void * valp,const char * perm)408 dsl_check_access(objset_t *mos, uint64_t zapobj,
409 char type, char checkflag, void *valp, const char *perm)
410 {
411 int error;
412 uint64_t jumpobj, zero;
413 char whokey[ZFS_MAX_DELEG_NAME];
414
415 zfs_deleg_whokey(whokey, type, checkflag, valp);
416 error = zap_lookup(mos, zapobj, whokey, 8, 1, &jumpobj);
417 if (error == 0) {
418 error = zap_lookup(mos, jumpobj, perm, 8, 1, &zero);
419 if (error == ENOENT)
420 error = SET_ERROR(EPERM);
421 }
422 return (error);
423 }
424
425 /*
426 * check a specified user/group for a requested permission
427 */
428 static int
dsl_check_user_access(objset_t * mos,uint64_t zapobj,const char * perm,int checkflag,cred_t * cr)429 dsl_check_user_access(objset_t *mos, uint64_t zapobj, const char *perm,
430 int checkflag, cred_t *cr)
431 {
432 const gid_t *gids;
433 int ngids;
434 int i;
435 uint64_t id;
436
437 /* check for user */
438 id = crgetuid(cr);
439 if (dsl_check_access(mos, zapobj,
440 ZFS_DELEG_USER, checkflag, &id, perm) == 0)
441 return (0);
442
443 /* check for users primary group */
444 id = crgetgid(cr);
445 if (dsl_check_access(mos, zapobj,
446 ZFS_DELEG_GROUP, checkflag, &id, perm) == 0)
447 return (0);
448
449 /* check for everyone entry */
450 id = -1;
451 if (dsl_check_access(mos, zapobj,
452 ZFS_DELEG_EVERYONE, checkflag, &id, perm) == 0)
453 return (0);
454
455 /* check each supplemental group user is a member of */
456 ngids = crgetngroups(cr);
457 gids = crgetgroups(cr);
458 for (i = 0; i != ngids; i++) {
459 id = gids[i];
460 if (dsl_check_access(mos, zapobj,
461 ZFS_DELEG_GROUP, checkflag, &id, perm) == 0)
462 return (0);
463 }
464
465 return (SET_ERROR(EPERM));
466 }
467
468 /*
469 * Iterate over the sets specified in the specified zapobj
470 * and load them into the permsets avl tree.
471 */
472 static int
dsl_load_sets(objset_t * mos,uint64_t zapobj,char type,char checkflag,void * valp,avl_tree_t * avl)473 dsl_load_sets(objset_t *mos, uint64_t zapobj,
474 char type, char checkflag, void *valp, avl_tree_t *avl)
475 {
476 zap_cursor_t zc;
477 zap_attribute_t za;
478 perm_set_t *permnode;
479 avl_index_t idx;
480 uint64_t jumpobj;
481 int error;
482 char whokey[ZFS_MAX_DELEG_NAME];
483
484 zfs_deleg_whokey(whokey, type, checkflag, valp);
485
486 error = zap_lookup(mos, zapobj, whokey, 8, 1, &jumpobj);
487 if (error != 0)
488 return (error);
489
490 for (zap_cursor_init(&zc, mos, jumpobj);
491 zap_cursor_retrieve(&zc, &za) == 0;
492 zap_cursor_advance(&zc)) {
493 permnode = kmem_alloc(sizeof (perm_set_t), KM_SLEEP);
494 (void) strlcpy(permnode->p_setname, za.za_name,
495 sizeof (permnode->p_setname));
496 permnode->p_matched = B_FALSE;
497
498 if (avl_find(avl, permnode, &idx) == NULL) {
499 avl_insert(avl, permnode, idx);
500 } else {
501 kmem_free(permnode, sizeof (perm_set_t));
502 }
503 }
504 zap_cursor_fini(&zc);
505 return (0);
506 }
507
508 /*
509 * Load all permissions user based on cred belongs to.
510 */
511 static void
dsl_load_user_sets(objset_t * mos,uint64_t zapobj,avl_tree_t * avl,char checkflag,cred_t * cr)512 dsl_load_user_sets(objset_t *mos, uint64_t zapobj, avl_tree_t *avl,
513 char checkflag, cred_t *cr)
514 {
515 const gid_t *gids;
516 int ngids, i;
517 uint64_t id;
518
519 id = crgetuid(cr);
520 (void) dsl_load_sets(mos, zapobj,
521 ZFS_DELEG_USER_SETS, checkflag, &id, avl);
522
523 id = crgetgid(cr);
524 (void) dsl_load_sets(mos, zapobj,
525 ZFS_DELEG_GROUP_SETS, checkflag, &id, avl);
526
527 (void) dsl_load_sets(mos, zapobj,
528 ZFS_DELEG_EVERYONE_SETS, checkflag, NULL, avl);
529
530 ngids = crgetngroups(cr);
531 gids = crgetgroups(cr);
532 for (i = 0; i != ngids; i++) {
533 id = gids[i];
534 (void) dsl_load_sets(mos, zapobj,
535 ZFS_DELEG_GROUP_SETS, checkflag, &id, avl);
536 }
537 }
538
539 /*
540 * Check if user has requested permission.
541 */
542 int
dsl_deleg_access_impl(dsl_dataset_t * ds,const char * perm,cred_t * cr)543 dsl_deleg_access_impl(dsl_dataset_t *ds, const char *perm, cred_t *cr)
544 {
545 dsl_dir_t *dd;
546 dsl_pool_t *dp;
547 void *cookie;
548 int error;
549 char checkflag;
550 objset_t *mos;
551 avl_tree_t permsets;
552 perm_set_t *setnode;
553
554 dp = ds->ds_dir->dd_pool;
555 mos = dp->dp_meta_objset;
556
557 if (dsl_delegation_on(mos) == B_FALSE)
558 return (SET_ERROR(ECANCELED));
559
560 if (spa_version(dmu_objset_spa(dp->dp_meta_objset)) <
561 SPA_VERSION_DELEGATED_PERMS)
562 return (SET_ERROR(EPERM));
563
564 if (ds->ds_is_snapshot) {
565 /*
566 * Snapshots are treated as descendents only,
567 * local permissions do not apply.
568 */
569 checkflag = ZFS_DELEG_DESCENDENT;
570 } else {
571 checkflag = ZFS_DELEG_LOCAL;
572 }
573
574 avl_create(&permsets, perm_set_compare, sizeof (perm_set_t),
575 offsetof(perm_set_t, p_node));
576
577 ASSERT(dsl_pool_config_held(dp));
578 for (dd = ds->ds_dir; dd != NULL; dd = dd->dd_parent,
579 checkflag = ZFS_DELEG_DESCENDENT) {
580 uint64_t zapobj;
581 boolean_t expanded;
582
583 /*
584 * If not in global zone then make sure
585 * the zoned property is set
586 */
587 if (!INGLOBALZONE(curthread)) {
588 uint64_t zoned;
589
590 if (dsl_prop_get_dd(dd,
591 zfs_prop_to_name(ZFS_PROP_ZONED),
592 8, 1, &zoned, NULL, B_FALSE) != 0)
593 break;
594 if (!zoned)
595 break;
596 }
597 zapobj = dsl_dir_phys(dd)->dd_deleg_zapobj;
598
599 if (zapobj == 0)
600 continue;
601
602 dsl_load_user_sets(mos, zapobj, &permsets, checkflag, cr);
603 again:
604 expanded = B_FALSE;
605 for (setnode = avl_first(&permsets); setnode;
606 setnode = AVL_NEXT(&permsets, setnode)) {
607 if (setnode->p_matched == B_TRUE)
608 continue;
609
610 /* See if this set directly grants this permission */
611 error = dsl_check_access(mos, zapobj,
612 ZFS_DELEG_NAMED_SET, 0, setnode->p_setname, perm);
613 if (error == 0)
614 goto success;
615 if (error == EPERM)
616 setnode->p_matched = B_TRUE;
617
618 /* See if this set includes other sets */
619 error = dsl_load_sets(mos, zapobj,
620 ZFS_DELEG_NAMED_SET_SETS, 0,
621 setnode->p_setname, &permsets);
622 if (error == 0)
623 setnode->p_matched = expanded = B_TRUE;
624 }
625 /*
626 * If we expanded any sets, that will define more sets,
627 * which we need to check.
628 */
629 if (expanded)
630 goto again;
631
632 error = dsl_check_user_access(mos, zapobj, perm, checkflag, cr);
633 if (error == 0)
634 goto success;
635 }
636 error = SET_ERROR(EPERM);
637 success:
638
639 cookie = NULL;
640 while ((setnode = avl_destroy_nodes(&permsets, &cookie)) != NULL)
641 kmem_free(setnode, sizeof (perm_set_t));
642
643 return (error);
644 }
645
646 int
dsl_deleg_access(const char * dsname,const char * perm,cred_t * cr)647 dsl_deleg_access(const char *dsname, const char *perm, cred_t *cr)
648 {
649 dsl_pool_t *dp;
650 dsl_dataset_t *ds;
651 int error;
652
653 error = dsl_pool_hold(dsname, FTAG, &dp);
654 if (error != 0)
655 return (error);
656 error = dsl_dataset_hold(dp, dsname, FTAG, &ds);
657 if (error == 0) {
658 error = dsl_deleg_access_impl(ds, perm, cr);
659 dsl_dataset_rele(ds, FTAG);
660 }
661 dsl_pool_rele(dp, FTAG);
662
663 return (error);
664 }
665
666 /*
667 * Other routines.
668 */
669
670 static void
copy_create_perms(dsl_dir_t * dd,uint64_t pzapobj,boolean_t dosets,uint64_t uid,dmu_tx_t * tx)671 copy_create_perms(dsl_dir_t *dd, uint64_t pzapobj,
672 boolean_t dosets, uint64_t uid, dmu_tx_t *tx)
673 {
674 objset_t *mos = dd->dd_pool->dp_meta_objset;
675 uint64_t jumpobj, pjumpobj;
676 uint64_t zapobj = dsl_dir_phys(dd)->dd_deleg_zapobj;
677 zap_cursor_t zc;
678 zap_attribute_t za;
679 char whokey[ZFS_MAX_DELEG_NAME];
680
681 zfs_deleg_whokey(whokey,
682 dosets ? ZFS_DELEG_CREATE_SETS : ZFS_DELEG_CREATE,
683 ZFS_DELEG_LOCAL, NULL);
684 if (zap_lookup(mos, pzapobj, whokey, 8, 1, &pjumpobj) != 0)
685 return;
686
687 if (zapobj == 0) {
688 dmu_buf_will_dirty(dd->dd_dbuf, tx);
689 zapobj = dsl_dir_phys(dd)->dd_deleg_zapobj = zap_create(mos,
690 DMU_OT_DSL_PERMS, DMU_OT_NONE, 0, tx);
691 }
692
693 zfs_deleg_whokey(whokey,
694 dosets ? ZFS_DELEG_USER_SETS : ZFS_DELEG_USER,
695 ZFS_DELEG_LOCAL, &uid);
696 if (zap_lookup(mos, zapobj, whokey, 8, 1, &jumpobj) == ENOENT) {
697 jumpobj = zap_create(mos, DMU_OT_DSL_PERMS, DMU_OT_NONE, 0, tx);
698 VERIFY(zap_add(mos, zapobj, whokey, 8, 1, &jumpobj, tx) == 0);
699 }
700
701 for (zap_cursor_init(&zc, mos, pjumpobj);
702 zap_cursor_retrieve(&zc, &za) == 0;
703 zap_cursor_advance(&zc)) {
704 uint64_t zero = 0;
705 ASSERT(za.za_integer_length == 8 && za.za_num_integers == 1);
706
707 VERIFY(zap_update(mos, jumpobj, za.za_name,
708 8, 1, &zero, tx) == 0);
709 }
710 zap_cursor_fini(&zc);
711 }
712
713 /*
714 * set all create time permission on new dataset.
715 */
716 void
dsl_deleg_set_create_perms(dsl_dir_t * sdd,dmu_tx_t * tx,cred_t * cr)717 dsl_deleg_set_create_perms(dsl_dir_t *sdd, dmu_tx_t *tx, cred_t *cr)
718 {
719 dsl_dir_t *dd;
720 uint64_t uid = crgetuid(cr);
721
722 if (spa_version(dmu_objset_spa(sdd->dd_pool->dp_meta_objset)) <
723 SPA_VERSION_DELEGATED_PERMS)
724 return;
725
726 for (dd = sdd->dd_parent; dd != NULL; dd = dd->dd_parent) {
727 uint64_t pzapobj = dsl_dir_phys(dd)->dd_deleg_zapobj;
728
729 if (pzapobj == 0)
730 continue;
731
732 copy_create_perms(sdd, pzapobj, B_FALSE, uid, tx);
733 copy_create_perms(sdd, pzapobj, B_TRUE, uid, tx);
734 }
735 }
736
737 int
dsl_deleg_destroy(objset_t * mos,uint64_t zapobj,dmu_tx_t * tx)738 dsl_deleg_destroy(objset_t *mos, uint64_t zapobj, dmu_tx_t *tx)
739 {
740 zap_cursor_t zc;
741 zap_attribute_t za;
742
743 if (zapobj == 0)
744 return (0);
745
746 for (zap_cursor_init(&zc, mos, zapobj);
747 zap_cursor_retrieve(&zc, &za) == 0;
748 zap_cursor_advance(&zc)) {
749 ASSERT(za.za_integer_length == 8 && za.za_num_integers == 1);
750 VERIFY(0 == zap_destroy(mos, za.za_first_integer, tx));
751 }
752 zap_cursor_fini(&zc);
753 VERIFY(0 == zap_destroy(mos, zapobj, tx));
754 return (0);
755 }
756
757 boolean_t
dsl_delegation_on(objset_t * os)758 dsl_delegation_on(objset_t *os)
759 {
760 return (!!spa_delegation(os->os_spa));
761 }
762